CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net income	$ 60,518	$ 18,676
Non-cash items included in net income:
Depreciation and amortization of furniture, equipment and leasehold improvements	8,119	6,585
Deferred income taxes	10,922	10,460
Amortization of intangible assets	229	0
Amortization of notes receivable	13,809	11,600
Amortization of debt issuance costs	164	165
Write-off of debt issuance costs	0	5
Provision for credit losses	(130)	17
Share-based compensation	21,767	9,662
Amortization of right-of-use lease assets	19,529	20,687
Gain on repurchase of senior secured notes	0	(51)
Decrease (increase) in operating assets:
Deposits with clearing organizations	(10,843)	(11,236)
Receivable from brokers, dealers and clearing organizations	8,157	(53,297)
Receivable from customers	(236,317)	115,433
Income tax receivable	3,170	(17,740)
Securities purchased under agreements to resell	5,842	0
Securities owned	(272,140)	(355,351)
Notes receivable	(16,749)	(15,375)
Corporate-owned life insurance	(9,079)	(6,231)
Other assets	3,872	498
Increase (decrease) in operating liabilities:
Drafts payable	1,221	14,521
Payable to brokers, dealers and clearing organizations	(42,361)	(199,662)
Payable to customers	(1,382)	(92,636)
Securities sold under agreements to repurchase	124,720	519,055
Securities sold but not yet purchased	171,987	(7,191)
Accrued compensation	(6,246)	(14,462)
Income tax payable	0	(4,130)
Accounts payable and other liabilities	(41,659)	(34,228)
Cash used in operating activities	(182,880)	(84,226)
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock	(4,985)	(4,904)
Issuance of Class A non-voting common stock	64	54
Repurchase of Class A non-voting common stock for cancellation	(9,603)	(31,241)
Payments for employee taxes withheld related to vested share-based awards	(6,844)	(5,907)
Addition to noncontrolling interests	0	171
Redemption of redeemable noncontrolling interests	500
Redemption of redeemable noncontrolling interests		(83)
Repurchase of senior secured notes	0	(1,000)
Increase in bank call loans	206,700	56,200
Cash provided by financing activities	185,832	13,290
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements	(1,887)	(12,470)
Proceeds from the settlement of Company-owned life insurance	2,342	2,161
Cash used in investing activities	455	(10,309)
Net increase (decrease) in cash, cash equivalents and restricted cash	3,407	(81,245)
Cash, cash equivalents and restricted cash, beginning of period	28,835	137,967
Cash, cash equivalents and restricted cash, end of period	32,242	56,722
Reconciliation of cash and cash equivalents and restricted cash within the condensed consolidated balance sheets:
Cash and cash equivalents	32,242	30,773
Restricted cash	0	25,949
Total cash and cash equivalents and restricted cash	32,242	56,722
Schedule of non-cash financing activities
Employee share plan issuance	13,951	9,376
Supplemental disclosure of cash flow information
Cash paid during the period for interest	67,273	51,685
Cash paid during the period for income taxes, net	$ 13,900	$ 20,666